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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Condensed Matter Physics

Background:

  • The Y3+Rh4Ge13- and Y3+Ir4Ge13- series exhibit polymorphism, a phenomenon where a solid material can exist in more than one crystal structure.
  • Understanding structural transformations is crucial for predicting and tuning material properties, particularly in intermetallic compounds.
  • The Remeika prototype (Yb3Rh4Sn13) serves as a reference for the structural variations observed in these Y-based germanides.

Purpose of the Study:

  • To investigate the structural polymorphism in the Y3+Rh4Ge13- and Y3+Ir4Ge13- series as a function of Yttrium content.
  • To explore the superconducting properties and thermal conductivity of these compounds.
  • To analyze the relationship between structural changes, electronic structure, and potential phase transitions like charge density waves.

Main Methods:

  • X-ray diffraction (XRD) was used to determine the crystal structures and lattice parameters of the synthesized compounds.
  • Superconducting transition temperatures (Tc) were measured to characterize their superconducting behavior.
  • Thermal conductivity and Seebeck coefficients were measured, and electronic structure calculations were performed.

Main Results:

  • Polymorphism was observed, with Y3.6Rh4Ge12.4 adopting a primitive cubic structure (Pm3̄n), while lower Y-content compounds (x=0.4, 0) transitioned to body-centered cubic (I4132) and tetragonal (I41/amd) structures, respectively.
  • Similar structural symmetry lowering was found in the Y3+Ir4Ge13- series.
  • Compounds exhibit weak-coupled BCS-like superconductivity with Tc values up to 1.25 K, low thermal conductivity (<1.5 W K-1 m-1), and small Seebeck coefficients. Y3Rh4Ge13 shows a first-order phase transition at 177 K, indicative of a charge density wave.

Conclusions:

  • The Y-content significantly influences the crystal structure of Y-Rh-Ge and Y-Ir-Ge compounds, leading to a series of related structures derived from the Remeika prototype.
  • These materials are weakly-coupled superconductors with properties suitable for exploring low-temperature phenomena.
  • The observed phase transition in Y3Rh4Ge13 suggests an electronic instability, further supported by electronic structure calculations indicating the instability of idealized structures.